Carbamyl disulphides and preparation thereof



zation of rubber. The invention involves, among remove anytraces of benzol that may remain. 6 other things, the discovery that mixed carbamyl The desired reaction product is obtained from the disulphides may be prepared by interacting a wacold solution as a caked mass which readily dister-soluble salt of a substituted dithiocarbamic solves in hot water. The reaction involved is beacid and an aromatic sulphur halide of the type lieved to be represented by the following equation:

' oootm S oooim lo o,N s-is' i' 4 a';s 'i'-N(oiiir)i-- oii-r SS'ON( :Hs)n+Na Br represented by the formula -XSR wherein R In lieu of the sodium salt of diethyl dithiom is an aromatic radical and X is a halogen. The carbamic acid there may be employed any watercompounds which the invention concerns may be soluble salt of an N-substituted dithiocarbamic illustrated by the type formula acid. Examples are sodium pentamethylene di- RI 8 thiocarbamate, ammonium dimethyl dithiocarl l bamate, potassium dipropyl dithiocarbamate, sodium ethyl phenyl dithiocarbamate, potassium Bl dicyclohexyl dithiocarbamate and the like. Still wherein R is the aromatic radical of the aromatic 0131161. dithiocarbamic acid. saltswhich may be emm sulphur halide, wherein Ri-is either hydrogen or ployed are,f01 a p e, d v ves f such amines an aliphatic or aromatic radical, and wherein R2 as cyclohexylamlriei hexahydroqwnohne, t yl is an aliphatic or aromatic radical. In some aniline, morpholme, me yl cyclohexylamlne,

' cases, R1 and R2 may be regarded as joined to ethyl y ih ne, dibuty amine, butylamine,

' form a closed chain, either directly or through a dibenzylamilllei (11,150 l amine, d1 t yd heterogeneous atom. In no case, however, will fulfuryl armlne, methyl p hy a ine, dl-furboth R1 and R2 be strictly aromatic. furylamine, butyl cyclohexylamine and the like.

In the practice of the invention, these reaction Generally the ammonium and k i metal salts products may be prepared by heating the desired Will be found Preferable, although t e s, Such as aromatic sulphur halide and the desired waterj the admium, n a d a um al s may be em- 7 soluble salt of a substituted dithio-carbamic acid P y if desired; in a liquid medium. As a rule, it will be found In e d f enZ0y1 4-r1i ro phenyl sulphur preferable to heat the materials in a vessel atbromide may be e p y d Such aromatic Sulphur tached to a reflux condenser. Any suitable liquid al de a t e low g; medium maybe employed, but water, benzol, car- 7 V bon bisulphide or the like will usually be found to g r 40 be satisfactory gepemlflit is desirable t o10sci (Chem.Zenttalblatt, 1 928 vol. 2, page one. ploy a liquid medium 1n which the respective re- Annalen 416, pages 80-112) actants can be readily dissolved or otherwise (115- 7 persed, thus facilitating the reaction. It is pos-. sible to disperse or dissolve the reactants separate- G (1 chem SW Ab. 1912' page 763) ly and later combine the liquids containing them or to disperse or dissolve them both in the same A N0, liquid. g V

Illustrating the invention, the reaction product E G- of Z-benzoyl 4-nitro phenyl sulphur bromide and the sodium salt of diethyl dithiocarbamic acid cm may be prepared by reacting in benzol solution 8.5 No parts by weight of sodium diethyl dithiocar- (Annalen pages 103.125) bamate and 16.9 parts by weight of benzoyl 4-nid e Patented Dec. 17, 193$ UNITED STATES CARBAMYL DISULPHIDES AND PREPARATION THEREOF ,Jan Teppema,-Cuyahoga Falls, Ohio, assignor to Wmgfoot Corporation, Wilmington, Del., a corporation of Delaware No Drawing. Application March 20, 1934, Serial No. 716,505

22 Claims. (Cl. 26016) This invention has for its object carbamyl disulphides and. the process of preparing them which compounds are valuable both as such and in conjunction with other substances in the vulcanitro phenyl sulphur. bromide. This mixture is heated under a reflux condenser for a period of approximately one hour, after which the volatile constituents are distilled off upon a steam bath. The residue is then poured into boiling water to In lieu of the foregoing, the corresponding bromides and iodides may of course be used. Others are, for example, phenyl sulphur chloride, phenyl sulphur bromide, para nitro phenyl sulphur chlorride, ortho tolyl sulphur chloride, 2-nitro 4-acetyl phenyl sulphur bromide, l-brom naphthyl 2-sulphur bromide, and the like.

It is apparent that by the practice'of the invention an extremely simple method of preparing mixed disulphides of various organic compounds is provided.

Examples of compounds that may be prepared by thismethod are 2-benzoyl 4-nitro phenyl diethyl thio carbamyl disulphide, 2-benzoyl 4-nitro phenyl dimethyl thio carbamyl disulphide, 2- benzoyl l-nitro phenyl dibutyl thio carbamyl disulphide, 2-benzoyl 4-nitro phenyl dicyclohexyl thio carbamyl disulphide, 2-benzoy1 4-nitro phenyl pentamethylene thio carbamyl disulphide, 2-benzoyl 4-nitro phenyl ethyl cyclohexyl thio carbamyl disulphide, o-nitro phenyl ethyl cyclohexyl thio carbamyl disulphide, o-nitro phenyl dicyclohexyl thio carbamyl disulphide, o-nitro phenyl dimethyl thio carbamyl disulphide, o-nitro phenyl diamyl thio carbamyl disulphide, o-nitro phenyl morpholyl, thio carbamyl disulphide, etc. Still others are 2-nitro 4-ch1or phenyl morpholyl thio carbamyl disulphide, 2-nitro l-chlor phenyl pentamethylene thio carbamyl disulphide, 2- nitro 4-ch1or phenyl difurfuryl thio carbamyl disulphide, ortho tolyl ethyl phenyl thio carbamyl disulphide, ortho tolyl dibenzyl thio carbamyl disulphide, l-nitro phenyl dibenzyl thio carbamyl disulphide, 2-4-dinitro phenyl dibenzyl thio carbamyl disulphide, 2-4-dinitro phenyl dimethyl thio carbamyl disulphide and 2-nitro B-methylphenyl dimethyl thio-carbamyl disulphide.

This application is, in part, a continuation of application Serial No. 525,043, filed March 24,

a 1931, which is a continuation of application Serial No. 239,267, filed December 10, 1927, since matured into Patent No. 1,809,457.

Although only the preferred embodiments of the invention have been described, it will be apparent to those skilled in the art that the invention is not so limited but that various modifications may be made therein without'departing from the spirit of theinvention or from the scope of the appended claims. It is intended that the patent shall cover, by suitable expression in the appended claims, whatever features of patentable novelty reside in the invention.

What I claim is:

1. The reaction product of 2-.benzoyl 4-nitro phenyl sulphur bromide and the sodium salt of diethyl dithiocarbamic acid.

2. The reactionproductof a 2-benzoyl 4-mtro phenyl sulphur halide and an alkali metal N-alkyl dithiocarbamate.

3. The reaction product of a phenyl sulphur halide and an alkali metal N-alkyl dithiocarbamate.

4. A reaction product of a nitro-substituted benzenoid sulphur halide and an alkali metal salt of a dithiocarbamate.

5. A material having the formula in which R is a benzene group and R1 and R2 are alkyl groups.

6. A method of preparing materials having the formula in which R is a benzenoid group and R1 and R2 are 'alkyl groups, which comprises reacting a benzenoid sulphur halide with an N-alkylated. di-

thiocarbamate.

7. A compound having the formula N--CSSR Ra wherein R1 is a radical selected from hydrogen and the hydrocarbons, R2 is an aliphatic radical and R is an aromatic radical in which a ring of the aromatic nucleus is directly connected to the sulphur atom of the disulphide group.

8. A compound having the formula R2 wherein R1 is a radical selected from hydrogen and the hydrocarbons, R2 is an aliphatic radical and R is anaromatic group of the benzene and naphthalene series in which a ring of the aro- .3

matic nucleus :is directly connected to the sulphur. atom of the disulphide group.

' 9.. A :compound having the formula wherein R1 and R2 are hydrocarbon and R is an aromatic radical in which a ring of the aromatic nucleus is directly connected to the sulphur atom CzHa S 12. The process of preparing materials having the'formula' -i.n-which-R is an aromatic radical, Rz'is alkyl and R1 is a radical selected from hydrogen and the hydrocarbons, which comprises reacting an arcmatic sulphur halide with an N-alkylated dithiocarbamate.

13. Theprocess of preparing disulphides having the formula \N(JBB-R Rf wherein.Rziaaznitrmaromatic radical of the henzene and naphthalene series and R1 and R2 are v hydrocarbon radicals, which comprises reacting OzN 8-8-3 in which R represents an N-substituted thio carbamyl radical which comprises reacting a 2-benzoyl 4-nitro phenyl sulphur halide with a water soluble salt of an N-substituted dithiocarbamic acid. 7

16. The process of preparing compounds having the formula C O CaHa OnN S--S-R in which R represents an N-disubstituted thio carbamyl radical which comprises reacting 2-benzoyl 4-nitro phenyl sulphur bromide with an alkali metal salt of an N-disubstituted dithiocarbamic acid.

17. The process of preparing 2-benzoyl 4-nitro phenyl diethyl thio carbamyl disulphide which comprises reacting a Z-benzoyl 4-nitrophenyl sulphur halide with a water soluble salt of diethyl dithiocarbamic acid.

18. The process of preparing an aromatic thio carbamyl disulphide in which the aromatic radical is directly attached to a disulphide sulphur atom which comprises reacting an aromatic sulphur halide with a water soluble dithiocarbamate.

19. An aromatic thio carbamyl disulphide in which the aromatic radical is directly attached to a disulphide sulphur atom.

20. A process of preparing a rubber vulcanization accelerator which comprises reacting a dithio-carbamate with a nitro substituted phenyl halogen mercaptan. v

21. A process of preparing a, rubber vulcanization accelerator which comprises reacting a dithio-carbamate with a nitro substituted aryl halogen mercaptan.

22. The product formed by reacting a di-thiocarbamate with a nitro substituted phenyl halogen mercaptan.

JAN TEPPEMA. 

